Simplify -3 xy3 + 7 xy3 + (- xy3 ) + (-3 xy3 ).
0
xy3
3 xy3
- xy3

What is the value of x in the diagram below?

Vertical angles must check all that apply

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?